You are getting the ARRAY(0x....) output because you are asking Perl to stringify array references with this code:

    push(@report, [$csv->fields]);
    
    # Later...
    return ( join( "\n", @report ) );
[download]

The [ ] brackets create an anonymous ARRAY ref and stick the contents of $csv->fields inside. Hence @report contains a bunch of references, and when you try to join them, you just get a bunch of ARRAY(0x...) strings.

Using ARRAY refs in @report was probably the right idea, so now you just need to do a little extra work to dereference each element and join them together. Here's a quick runnable example illustrating the idea:

    my @refs = ([qw/foo bar baz/], [qw/fee fie foe/], [qw/red green/])
+;
 
    print join "\n", map { join ',', @$_ } @refs;
[download]

Instead of printing the result of join, you can of course assign it to a scalar.

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